[RTTY] Contesting w/ 2 Tone & MMTTY

[John Merrill]

2 Tone does not print transmitted signal in N1MM either.

John N1JM


On Sun, Apr 7, 2013 at 12:07 PM, Mike <k4gmh at arrl.net> wrote:

> 2 Tone was used along with MMTTY in the recent EA RTTY Contest.  What a
> difference having two different decoders working
> on the same signal.  Most of the time, both displayed the same
> information.  However, there
> were enough differences to having both decoders a true benefit.  Which one
> was better -
> depends.  But then that is to be expected as both are very good.
>
> The MMTTY kept in the FIR filter, with 400 Bandpass.  AFC was turned off
> and receive mark freq.
> set to 2125. 2 Tone was kept in Main and Normal throughout the Contest.
>
> One feature of 2 Tone is the AFC is turned on all the time.  Since most of
> my operating is
> "Run", I wanted to see if the 2 Tone all the time AFC on would impact being
> able lock on
> the calling station before he would quit transmitting.  The call of several
> calling stations
> weren't copied before the other stations' transmission stopped.
> Fortunately, this wasn't as
> much of an issue as I had envisioned when first started using 2 Tone
> earlier in the week.
> MMTTY helped overcome the initial 2 Tone's loss of copying the other
> station.
>
> Over all, 2 Tone may be a bit better, but that is a subjective judgement.
> 2 Tone seemed
> to handle the weak signals better, while MMTTY seemed to decode a bit
> faster than 2 Tone.
> Yes, in most instances MMTTY and 2 Tone compliment each other making it
> possible to get
> the correct information from the other station without asking for a
> repeat.
>
> 2 Tone was the xmitting S/W and MMTTY used for the "Receive Only" clone
> window in Writelog.
> With this S/W arrangement, function key characters would be displayed in
> Writelog's Rttyrite
> window in clumps - three characters immediately displayed when the function
> key was pushed,
> followed by a delay and then a rapid display of another three characters,
> etc.  However,
> the "clumping" wasn't noticed in the xmission when listen on the monitor.
> "Hardware
> generated FSK" was used.  Tried "Software generated FSK TXD" and "Software
> generated
> FSK DTR" but neither would key the FSK.
>
> I plan on using both decoders as set up for future contests.  Eliminating
> the "clumping" function key characters is next issue need to work solving
> at this station.  Getting "Software generated...." capability working may
> be the answer.  (Also have to work on getting RF out of the computer, but
> that was a problem before 2 Tone:>)
>
> One other annoyance was the xmitted characters were only displayed on the
> xmitting Rttyrite window, 2 Tone, and not displayed on the clone window,
> MMTTY.  This may be a Writelog set-up issue on my part rather than a S/W
> issue.
>
> Thanks to all who took the time to write up how  to get 2 Tone set-up in
> Writelog and share it with us on the Internet.
>
>   73,
>   Mike, K4GMH
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